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Showing 1 to 14 of 14 for “"complex shear modulus"”.
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Complex shear modulus reconstruction using ultrasound shear-wave imaging
… soft tissue mechanical properties. Ultrasound shear-wave imaging can provide quantitative information about soft tissue mechanical properties, specifically the complex shear modulus. Advancing this field has the potential to bridge molecular, cellular, and tissue biology and to influence …
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Viscoelastic Modeling of Straight and Modified Binders at Intermediate and High Temperatures
… known as modified asphalt binders, have a more complex behavior than traditional binders. A review of the current mathematical models shows that most of them suffer from different drawbacks that make them inadequate for their intended application. To describe the behavior of straight and …
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Magnetic resonance elastography studies of human skeletal muscle
… properties by capturing the motion of induced shear waves via a synchronised Motion Encoding Gradient (MEG). The complex shear modulus is determined via mathematical inversion and reported as the magnitude of the complex shear modulus, |G*|, and phase angle, φ. The work reported in this thesis …
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Magnetomotive dynamics of magnetic particles for optical imaging contrast and elastography
… In addition, quantitative estimates of the complex shear modulus were obtained by measuring the propagating mechanical waves generated by an excitation of an inclusion containing magnetic nanoparticles (MNPs).
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Fluorescence laser tracking microrheology for quantitative studies of cytoskeletal mechanotransduction
… show power-law frequency variations of the complex shear modulus G*(co), the latter intracellular experiments identify multiple time and length scales affecting cell rheological features. Finally, FLTM evaluates frequency-specific stretch-induced cell mechanics and thus promises to broaden …
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Mechanical properties of F-actin network
… monitored to estimate the frequency-dependent complex shear modulus of an F-actin network. In the active approach, the response of an embedded microsphere to a driving force is tracked to obtain the strain-dependent viscoelasticity. The developed methods were applied to F-actin networks …
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Mechanical and Cellular Response to Biomineralization of Ovalbumin Scaffolds for Bone Tissue Engineering
… increase in each mineralized scaffold's complex shear modulus over unmineralized counterparts. Degradation in a PBS+collagenase XI environment showed that mineralization extended total time to degradation. It was also shown that the formation of the Ca-P crystals had no negative effects …
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Impact of recycled asphalt shingles on asphalt concrete characteristics
… program for the regular mixes included complex modulus, fracture, overlay reflective cracking resistance, wheel track permanent deformations, and push-pull fatigue tests. The asphalt binder replacement levels in the mix using combinations of RAS and RAP were in the range of 43% to 64%. …
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Quantitative estimates of mechanical properties from in vivo tumors of rodent animals
… focuses on using ultrasonic tools to image shear waves generated in spontaneous rodent mammary tumors to estimate the complex shear modulus under realistic conditions, and to assess the sensitivity for relating matrix viscoelasticity to tumor type and stage. Cylindrical, harmonic shear waves …
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Optical study of shear and longitudinal acoustic waves and complex relaxation dynamics of glass forming liquids
… (ISS) was refined and used to study the complex structural relaxation dynamics of glass forming liquids, allowing both empirical modeling and testing of the predictions of the mode-coupling theory (MCT). Longitudinal and shear acoustic waves throughout much of the MHz frequency range, …
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Rheological and nanomechanical characterization of aging in polymer modified asphalt
… properties such as viscosity, phase angle, shear modulus, creep compliance, stiffness, etc. are determined using Dynamic Shear Rheometer (DSR) test, Multiple Stress Creep Recovery (MSCR) test, Bending Beam Rheometer (BBR) test, Rotational Viscosity (RV) test and the Direct Tension (DT) test. …
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Effects of Storage on the Linear Viscoelastic Response of Polymer-Modified Asphalt at Intermediate to High Temperatures
… performance is polymer-modified binder. The complex behavior of polymer-modified binders, particularly over time, is not yet well-understood by engineers. Therefore, an experimental study was performed to determine the effects of four years of storage at room temperatures (23°C) on the …
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Development of the Duomorph Asphalt Rheology Tester (DART): a self-contained, portable device for quality assurance testing of asphalt binders
… both as a surrogate test device to the Dynamic Shear Rheometer (DSR) and also as a device capable of directly estimating the AASHTO M320 Table 1 specification parameters—the complex shear modulus (G*) and phase angle (d). The first phase of the research evaluated the physical and operational …
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Local calibration of the MEPDG prediction models for pavement rehabilitation and evaluation of top-down cracking for Oregon Roadways
… The laboratory investigation included dynamic modulus, indirect tensile (IDT) strength, and specific gravity testing on the HMAC cores, binder rheological tests on asphalt binder and aggregate gradation analysis. The FWD and DCP tests indicated that top-down cracked pavement sections were …